First get them softly to know why they started drinking at first, then from there you can pick up how to help without judging or criticizing them.

Reasons might be given like loneliness, heartbreak, depression etc……when you know the genesis of the cause, then you can know how to help them and keep been supportive throughout their recovery period.

Allow them to listen to testimonies of people they’ve had similar problems before, they will get one or two points that will help them have a change of mind……